---I didn't go to work yesterday because my car broke down.
---You ______ mine. I wasn't using it then.A.might borrowB.could have borrowedC.must have borrowedD.ought to borrow
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B解析该题考查虚拟语气的用法。从句意:“你本来是可以用我的车子，因我当时不用它，而你未用，”可知该空表示的是与过去事实相反的假设。用could have done。